Set top box



FIG. 1 is an expanded, perspective view of a set top box showing our design;

FIG. 2 is an expanded, front view thereof; and,

FIG. 3 is an expanded, side view thereof.

The broken lines depict portions of the set top box that form no part of the claimed design. 

CLAIM We claim the ornamental design for a set top box, as shown and described. 